Heard a bit of a scraping sound from the backend. I aborted my morning commute until I can investigate. Rolling slow and I hear a scraping type noise. U-joint? Maybe I drove over something and its stuck on the drive shaft......
Differential was drained and refilled 2,000 miles ago.

Forget it, that can't be fixed. You need a new Midget.

I need a "back up Midget". One to tie me over in case the main one goes a day or two without being roadworthy.
Yes, I see your point exactly.....good call.

My wife took my car out last week, and called me on the way home, she pulled over because there was a loud noise coming from the front drivers wheel.

I hopped in my car, and met her on the side of the road, took the wheel off and the brake dust shield had bent a little and was rubbing against the brake rotor, making a horrible noise. she claims she did not run anything over, that the noise just started happening.

So a little push on the brake shield and problem solved.

I know there are no disc brakes in the rear, but could a pebble or something have gotten into your brake drum? causing the noise you are hearing?

Sounds plausible, I was on a dirt road not long ago. I'll look it over tonight.

I would agree that a scraping/grinding noise would most likely be coming from the brakes...either brake wear or as stated above, something (a pebble?)kicked into the drum!

I can't see anything wrong. Jacked up the rear and spun the wheels, nothing. Pumped in a bit more oil in the differential but at very low speed, in 1st (can't detect in reverse) you hear this slow "scrape" in revolutions, like an engine turning over VERY slowly. It matches the ground speed. Can't detect at normal speeds. I guess I'll just monitor it and drive on. BTW rear bearing were renewed last year in rear hub rebuild, not that one isn't failing I guess.

Pinion brg.?

pulled drum, looks fine. I did notice that the "dust cover" the part right in front of #28 here:
http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=29295&SortOrder=31
is loose, maybe it let crud in and wrecked the bearing